.spec-preview {
  position: relative;
  width: 400px;
  height: 400px;
  border: 1px solid #ccc;
}
.spec-preview img {
  width: 100%;
  height: 100%;
}
.spec-preview .event {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 998;
}
.spec-preview .mask {
  width: 50%;
  height: 50%;
  background-color: rgba(0, 255, 0, 0.3);
  position: absolute;
  left: 0;
  top: 0;
  display: none;
}
.spec-preview .big {
  width: 100%;
  height: 100%;
  position: absolute;
  top: -1px;
  left: 100%;
  border: 1px solid #aaa;
  overflow: hidden;
  z-index: 998;
  display: none;
  background: white;
}
.spec-preview .big img {
  width: 200%;
  max-width: 200%;
  height: 200%;
  position: absolute;
  z-index: 999;
  left: 0;
  top: 0;
}
.spec-preview .event:hover ~ .mask,
.spec-preview .event:hover ~ .big {
  display: block;
}
